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storage.go
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storage.go
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/*
Copyright 2022 TriggerMesh Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package storage
import (
"sync"
)
// Storage is a simple object that provides thread safe
// methods to read and write into a map.
type Storage struct {
data map[string]map[string]interface{}
mux sync.RWMutex
}
// New returns an instance of Storage.
func New() *Storage {
return &Storage{
data: make(map[string]map[string]interface{}),
mux: sync.RWMutex{},
}
}
// Set writes a value interface to a string key.
func (s *Storage) Set(eventID, key string, value interface{}) {
s.mux.Lock()
defer s.mux.Unlock()
if s.data[eventID] == nil {
s.data[eventID] = make(map[string]interface{})
}
s.data[eventID][key] = value
}
// Get reads value by a key.
func (s *Storage) Get(eventID string, key string) interface{} {
s.mux.RLock()
defer s.mux.RUnlock()
if s.data[eventID] == nil {
return nil
}
return s.data[eventID][key]
}
// ListEventVariables returns the slice of variables created for EventID.
func (s *Storage) ListEventVariables(eventID string) []string {
s.mux.RLock()
defer s.mux.RUnlock()
list := []string{}
for k := range s.data[eventID] {
list = append(list, k)
}
return list
}
// ListEventIDs returns the list of stored event IDs.
func (s *Storage) ListEventIDs() []string {
s.mux.RLock()
defer s.mux.RUnlock()
list := []string{}
for k := range s.data {
list = append(list, k)
}
return list
}
// Flush removes variables by their parent event ID.
func (s *Storage) Flush(eventID string) {
s.mux.Lock()
defer s.mux.Unlock()
delete(s.data, eventID)
}